Issa M El-Nahhal, Shehata M Zourab, Nizam M El-Ashgar
الملخص العربي
Transparent monolithic silica doping with phenolphthalein has been prepared via the acid-catalyzed sol-gel reactions of tetraethylorthosilicate in the presence of phenolphthalein. The immobilized phenolphthalein pH-indicator shows similar behavior as its solution counterpart. The UV/Vis spectra indicate that the phenolphthalein retains its structure during the sol-gel reactions in terms of response to pH. The phenolphthalein can be regarded as uniformly distributed in the silica matrix. This observation has been confirmed using polarized microscopy.
تاريخ النشر
31/08/2001
الناشر
Journal of dispersion science and technology, Taylor & Francis Group
أ.د نظام محمود الأشقر | Prof. Nizam M. El-Ashgar | 13824